Re: [Xen-devel] [xen-unstable test] 18309: regressions - FAIL

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 10.07.13 at 23:50, xen.org <ian.jackson@xxxxxxxxxxxxx> wrote:
> flight 18309 xen-unstable real [real]
> http://www.chiark.greenend.org.uk/~xensrcts/logs/18309/ 
> 
> Regressions :-(
> 
> Tests which did not succeed and are blocking,
> including tests which could not be run:
>  test-amd64-i386-rhel6hvm-intel  9 guest-start.2           fail REGR. vs. 
> 18260

This (and a few more of the later spotted regressions) are due to
b0581b92 ("x86: make map_domain_page_global() a simple
wrapper around vmap()"). The issue, however, is older: vmap()
needs to have some lock around its call to map_pages_to_xen(),
as that function doesn't itself do any locking, and hence two
CPUs can end up populating the same intermediate page table.

Before sending a fix I will want to inspect all other users of the
function though, to make sure we don't have any other similar
latent issue.

Jan


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